hello please forgive me my bad englisch, but i found an very interersting article about that brainwaves thing on wikipedia (hopefully you understood me xD)...

it says that at an specific frequency you get some kind of "effects" through stimulating your brain with audio signals.
at 0.5 to 3.5Hz you will get in a very deep sleep or a meditative stance.
at 4 -6.5Hz you get a kind of sleep in which you think you're not sleeping aswell as a kind of hypnose or "Hypnagogisches Bewusstsein" (in german).

Biert Is Extraordinarily Rad & TerrificTwitter.com/Biert | D* | Proud member of the VVV"It's the unicorns paparazzi. They have finally found you and are coming to take you home, prince Biert." -- Faffy

It's the best thing ever. I always wake up refreshed after a sleep with The Hummer on low volume repeat. I was using a Logitech 5.1 surround system with a 300-watt subwoofer. The whole room was full of low end, even on a low volume. It is definitely one of the most comforting and relaxing sonorous experiences. I highly recommend sleeping to it every night. I did so for about 3.5 years straight.